ParserATNFactory.java 文件源码

public Handle _ruleRef(GrammarAST node) {
    Rule r = g.getRule(node.getText());
    if ( r==null ) {
        g.tool.errMgr.grammarError(ErrorType.INTERNAL_ERROR, g.fileName, node.getToken(), "Rule "+node.getText()+" undefined");
        return null;
    }
    RuleStartState start = atn.ruleToStartState[r.index];
    ATNState left = newState(node);
    ATNState right = newState(node);
    int precedence = 0;
    if (((GrammarASTWithOptions)node).getOptionString(LeftRecursiveRuleTransformer.PRECEDENCE_OPTION_NAME) != null) {
        precedence = Integer.parseInt(((GrammarASTWithOptions)node).getOptionString(LeftRecursiveRuleTransformer.PRECEDENCE_OPTION_NAME));
    }
    RuleTransition call = new RuleTransition(start, r.index, precedence, right);
    left.addTransition(call);

    node.atnState = left;
    return new Handle(left, right);
}